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Loud screeching noise coming from my KitchenAid Professional 600?

Every time I turn on my KitchenAid mixer, it emits a loud screeching noise and I have no idea why. Any ideas?

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It seems that the gears which turn the beater are either lacking grease or broken. See our guides here KitchenAid Professional 600 Troubleshooting

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Wow, this is a really old post, but I found the problem. It is the brushes. I bought a used one (KT2651) that was slow to move and squealed. Cleaned the commutator and swapped the brushes, no more squeal.

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